<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>菜鸟教程(runoob.com)</title><!--演示如何设置下边框的样式-->
<style>
p {border-style:solid;}
p.none {border-bottom-style:none;}/*简写属性，用于把下边框的所有属性设置到一个声明中*/
p.dotted {border-bottom-style:dotted;}
p.dashed {border-bottom-style:dashed;}
p.solid {border-bottom-style:solid;}
p.double {border-bottom-style:double;}
p.groove {border-bottom-style:groove;}
p.ridge {border-bottom-style:ridge;}
p.inset {border-bottom-style:inset;}
p.outset {border-bottom-style:outset;}
</style>
</head>

<body>
<p class="none">无底边界。</p>
<p class="dotted">点底边界。</p>
<p class="dashed">虚线底边界。</p>
<p class="solid">实线底边界。</p>
<p class="double">双线底边界。</p>
<p class="groove">凹槽底边界。</p>
<p class="ridge">垄状底边界。</p>
<p class="inset">嵌入底边界。</p>
<p class="outset">外凸底边界。</p>
</body>
</html>